Missing Tuxedo Cat Jackson in Clynder

Jackson is an eight year-old male scruffy tux American shorthair. He went outside at around 7am on Sunday morning (two days ago at the time of writing). This was while I was preparing breakfast for him and his sister. He hasn't come back. Jackson grew up as an indoor cat in New York City. He's become more accustomed to stepping outside since we moved to Scotland 18 months ago. Normally he'll go and sit around in the neighbour's gardens and they are familiar with him. Jackson is microchipped and on the Global Pet Register.